Calculating machine



Jan. 20, 1942. E. F. BRITTEN, JR

CALCULATING MACHINE Filed June 14, 1940 4 Sheets-Sheet 1 INVENTOR EDWIN F. BR\TTEH,JR

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v Jan. 20, 1942. BRITTEN, 41R I 2,270,793

CALCULATING MACHINE Filed June 14, 1940 4 Sheets-Sheet 2 Eowm F, BRITTEN,JR

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ATTORN EY Jan. 20, 1942. v E. F. BRITTEN, JR

CALCULATING MACHINE Filed June 14, 1940 4 Sheets-Sheet 5 Jan. 20, 1942.

E. F. BRITTEN, JR 2,270,793

CALCULAT ING- MACHINE Filed June 14, 1940 4 Sheets-Sheet 4 gin 0W Eowm F. BRHTEH ,drz.

Patented Jan. 20, 1942 CALCULATING MACHINE Edwin F. Britten,

Jr., Short Hills, N. J., assignor to Monroe Calculating Machine Company,

Orange, N. J., a

corporation of Delaware Application June 14, 1940, Serial No. 340,590

Claims.

The invention relates to calculating machines, and more particularly to means for controlling the registration devices of such machines in the solution of arithmetical problems such as division of an, amount registered in the numeral wheels of the machine by an amount set up on the keyboard.

The invention consists in the novel construc- V tion and combinationsbfparts as hereinafter set forth in the claims.

In the accompanying drawings,

Figure 1 is a right side elevation of the machine, showing the invention as applied thereto, with the division key and the change lever in normal position, parts being broken away.

Figure 2 is a detail side view, showing the division key and the change lever in divide position, the movement transmitting means between said key and said lever and the manipulative means for restoring the change lever to normal position.

Figure 3 is a detail side view, showing the change lever in forward position and also in up position, and a portion of th movement transmitting means, parts being broken away.

Figure 4 is a left side elevation of the machine, showing the clutch for the reversible actuator driving train of gears, the division lever and a portion of said movement transmitting means, parts being broken away.

Figure 5 is a perspective view of the invention as applied, parts being broken away. I

Figure 6 is a detail fragmentary longitudinal section of the change lever, showing th means for holding the adjustment of the slidable section thereof.

Figure 7 is a detail perspective view of the train of gears to the counter register, showing the clutch thereof and the connecting rod to the change lever, parts being broken away.

Figure 8 is a detail perspective view of the change lever.

In these drawings, the invention is shown as applied to a Monroe calculating machine, such for instance as disclosed in the U. S. patent to Overbury, No. 1,964,478, dated June 26, 1934, reference beingmade to the disclosure of the U. S. patent to Hilder, No. 2,160,361, dated May 30, 1939.

In. accord with the disclosure of said patents, amounts set up on the keyboard are registered either once or repeatedly in the numeral wheels I3 mounted upon the shiftable carriage 2 upon operation of the machine through one or more cycles, and the number of cycles is registered in the counting wheels 85, also mounted upon said carriage. Electrically operated motor drive mechanism for the machine is provided as disclosed in the U. S. patent to Chase, No. 1,566,650, dated December 22, 1925.

Also in accord with the disclosures of said patents, the machine is provided with differential actuators for the numeral wheels 13, and the motor drive mechanism of the machine includes a reversible actuator driving train of gears having means including a c1utch for effecting its reversal, a reversible carriage shifting train having right and left shift clutches and a reversible counter register train having means including a clutch for effecting its reversal. Control means includes a division key for controlling the clutch of the actuator driving train, the left shift clutch and the clutch of the counter register train.

Automatic division The dividend having been registered in the numeral wheels l3 and the divisor set up on the keyboard of the machine, the division op-' eration will be performed following setting of the division key 2M to operative position. In

this division operation the divisor is subtracted cation problems, in which case the multiplicand would be set up on the keyboard. In multiplication operations, registrations in the counter register and in the numeral wheels l3 are of the same arithmetical sign, whereas in division operations such registrations are of unlike arithmetical sign, to effect which the counter register driving train is driven from the reversible drive means for said wheels 13 and is further provided with reversing-means, including a clutch.

Thus the wheels l3 constitute a product-divi dend register, and the wheels 85 constitute a multiplier-quotient register.

Heretofore and also in the present disclosure, the clutch for effecting the reversal of the counter register driving train is capable of manual control, and in the aforesaid Hilder patent means are provided for automatically controlling this clutch.

An object of the present invention is to render a manipulative device or lever for such control the same with a rock lever ll the lower arm of so that normally, thedivision key being set for a division operation, said device or lever will also be simultaneously set to divide position, whereas alternatively if said device or lever is not set by the division key, it is capable of independent setting to control said clutch, sothat if desired the quotient may be registered complementally.

Inorder to carry out the invention there is provided movement transmitting means between the division key 2M and said manipulative device or lever, hereinafter termed the change lever, said movement transmitting means being effec tive for setting thechange lever upon setting the division key and ineflective -for restoring the change lever upon restoration of said key, and means carried by the change lever for presetting said movement transmitting means to ineffective or alternatively effective. condition for settin said change lever upon setting the division key.

The change lever 3 has a rod 4 connecting the same with the clutch lever l for adjusting the clutch 6 of'the counter register drive train of gears I', said change lever being settable from normal forward position (Fig. 1) to rearward position (Fig. 2), in consequence of which in the operation of the machine the counter register" wheels" will have the direction of their rotation reversed relative to the rotation of wheels IS.

The change lever is fulcrumed upon pin 8' in the stationary framing of the machine, and is provided with a slidable section 9, having upper and lower slot and pin connections 8, 8' with the main section, said slidable section having an up per handle extension and a lower pin II. The change lever slidable section is adjustable from the "up position of Fig. 3, to the down position of Fig. l, as a consequence of which the pin I! will be lowered therewith, whereas when the slidable section is adjusted from down to up position, said pin will be raised therewith.

In the setting of the change lever slidable section from up to down position, or alternatively from down to up position, the movement transmitting means between the division key and the change lever will be rendered effective or alternatively ineffective as aforesaid, by means now to be described.

The division key III has a rod I3 connecting which has pivoted thereto at I! the rear end of a member or link I, whichlink in the up position of the slidable section of the change lever is supported forwardly upon the lower pin II of said section, the pin engaging a horizontally elongated notch ll of said link and the upper edge of said notch contacting the pin. The forward end portion of said link is provided with an angular slot ll wherein works a pin I! of a cam 2|, said cam being pivoted at 2| in the stationary framing, the pin is in the up position of said In'this positioning of the parts,'upon setting the division key from normal forward position to rearward operative ordivide position the lever ll will be rocked and link It will be moved rearwardly, thereby moving pin is and cam 10 and camming the change lever from normal forward to rearward or divide position (Fig. 2), where it will be held by the rear edge 23 of said cam, which edge is concentric with the cam pivot 2 I.

Thus the movement transmitting means between the division key and the change lever is rendered effective for the purpose stated upon setting of the slidable section of the change lever from up to down position and consequent pivotal movement or setting of the link or member II from up to down position.

In this movement of cam 20, a member 24 having at its forward end slot and pin pivotal connection 25 with a manipulative device or lever 2|, and at its rear end portion supported by a lug 21 of said cam, will be raised pivotally by said lug, and at the end of the movement the hooked rear free end portion 28 of said member will be hooked partially around the upper pin I of the slot and pin connection of the two sections of the change lever (Fig. 2).

The manipulative device or lever 25 has one arm thereof provided with a coiled spring connection 29 with the forward end portion of said member 24, said spring being normally tensioned to hold the pin of the slot and pin connection 25 at the rear end of the slot, and in the movement of said member to the position stated, said spring will be further tensioned to maintain said member in said position.

Upon restoration of the division key to normal forward position, the link IE will be returned forwardly and the cam 2|) will also be returned to its first position, but the change lever will remain in rearward set position. The change lever can now be reset to normal forward position by manipulation of said device or lever 26, which may have other functions such as operation of keyboard clearing means functioning in the known manner.

In the setting of the change lever slidable section fromdown to up position, the pin l2 thereof I will be raised therewith, thereby raising the link slidable section of the change lever being located in the angle of said slot (Fig. 3), and the cam having its upper edge 22 contacting the upper pin I of the slot and pin connection I, I.

In the setting of the slidable section of the change lever from up to down position, the pin 12 thereof will be lowered therewith, which will permit the link IE to fall by gravity until it comes to rest upon the aforesaid pin I! of said cam, which latter pin will nowbe located at the upper end of the vertical branch of the angular slot ll (Figs. 1 and 2), and upon which pin the link I will now be supported forwardly.

i6 pivotally until the lower edge of the angular slot ll engages pin I! of cam 20 to stop the upward movement, said pin l9 being now located in the angle of said slot and the link being supported forwardly upon the pin I! of said slidable section.

In this positioning of the parts, upon setting the division key from normal forward to rearward or divide position, the lever M will be rocked and link it will be moved rearwardly as in the first instance, but the pin I! being nowlocated in the angle of slot II and the lower branch of said slot extending forwardly from said angle,

the pin will move idly in the slot and there will be'no' consequent movement of cam 20 to set the change lever to divide position.

Thus the movement transmitting means 'between the division key and the change lever will be rendered ineffective for the purpose stated upon setting of the change lever slidable section from down to up position and consequent pivotal iriiovement of the link Ii from down to up posi- This also, the link or member I may be switched from lower or "on position (Fig. 2)

wherein it is effective in transmitting movement to the cam 20, to raised or o position (Fig. 3)

wherein it is inefiective in transmitting move ment to said cam, and back again to lowered po sition, and said member l6 constitutes a switch manually or by manipulative device or lever 26, until the division key is reset to normal forward position.

The downward movement of the cam 20 is limited by framing stop 30 (Fig, 3).

Suitable elastically yieldable means, such for instance as shown in Figure 6, is provided to maintain the slidable section of the change lever in its up and down positions. Suitable elastically yieldable means is also provided to maintain the division key in its normal and divide positions and the change lever in its normal forward and rearward set positions. J

I claim: 1. In a calculating machine, having a productdividend register, a multiplier-quotient register, and meansincludiirg a division key foreifecting alternate minus and plus registrations in the product-dividend register; reversing means in cluding a manipulable device settable to render the multiplier-quotient register operativ'efor registrations of a sign character like or 'altematlyefor presetting said movement transmitting means to ineflective or-altematively effective condition for setting said device to render the one register operative for. registrations of a sign character unlike that of the other register upon setting said key.

. 3 dividend register, -a multiplier-quotient register,

' and means including a division key for effecting alternate minus and plus registrations in the product-dividend register; reversing means including a manipulable device'settableto render the multiplier-quotient register operative for registrations of a-sign character like or alternatively unlike that of the other register, movement transmitting means between the division key and said device efiective for setting the latter upon setting the former and ineffective for restoring said device upon restoring said key including a switch member, and means for presetting said switch member and said movement transmitting means to inefiective or alternatively eiTective condition for setting said device to render the one register operative for registrations of a sign character unlike that of the other register,upon setting said key.

4. In a calculating machine, having a productdividend register, a multiplier-quotient register,

- and means including a division key for effecting 2. In a calculating machine, having a productdividend register, a multiplier-quotient register,

' and means including a division key for eflecting presettingsaid movement transmitting means to ineffective or alternatively effective condition for setting said device to render the one register operative for-registrations or a sign character uns like that of the other-register upon setting said key, and normally ineffective manipulable means for restoring said manipulable device, said movement transmitting means having a device for rendering said restoring means elective.

3. In a calculating machine, having a productalternate minus and plus registrations in the product-dividend register; reversing means includinga manipulable device settable to renderthe multiplier-quotient register operative for registrations of a sign character like or alternaeilective or alternatively eifective condition for setting said device torender the one register operative' for registrations of a sign character unlike that of the other register upon setting said key. v 5. In a calculating machine, havinga productdividend register, -'a multiplier-quotient register, and means including a division key for eifecting alternate minus and plus registrations in the product-dividend register; reversing means including a manipulable device settable to render the multiplier-quotient register operative for registrations ofa sign character like or alternatively unlike that of.- the other register,jmovement transmitting means. between the division key and said device eflective for setting the latter up n setting the former and ineifective for re-' storing said device upon restoring said key including a switch member, means carried by said manipulable device and includinga slidable han- .dieportion thereof for presetting saidswitch member and said movement transmiting means to ineifective or alternatively eifective condition for setting" said device torender'the one register operative for registrations of a sign character unlike that of the other register upon setting said key, and normally ineifective manipulable means for restoring said manipulable device,said

movement "transmitting means havinga device 

